Gradually bring to a low boil and cook, stirring frequently for about 15 - 20 minutes. It will thicken and reduce to 1 ½ ounces. About 3 tablespoons. Set aside to cool.
Add the egg. Mix until blended and a thick batter forms. Stir in the ginger. Cover the dough and put in the refrigerator for at least one hour, until it is firm.